Direct physical contact with liquid hydrogen, cold vapor, or cold equipment can cause serious tissue damage. Momentary contact with a small amount of the liquid may not pose as great a danger of a burn because a protective vapor film may form. Danger of freezing occurs when large amounts are spilled and exposure is extensive.
Frozen tissue is painless and appears yellow and waxy. Tissue becomes painful and turns pink or red upon thawing.
Persons suffering from lack of oxygen should be moved to an area with normal atmosphere.
Cardiac malfunctions are likely when the internal body temperature drops to 80.2° F, and death may result when the internal body temperature drops to 76.4° F. If the body temperature is depressed, the patient must be warmed gradually to avoid shock and/or cardiac malfunctions.
Education about the risks of cold injury as well as preventive and emergency care should be incorporated into training programs for operations and emergency response if liquid hydrogen is likely to be encountered.
Medical assistance for a cryogenic-induced injury should be obtained as soon as possible. Treatment of frozen tissue requires medical supervision because incorrect first aid practices invariably aggravate the injury.
It is safest to do nothing except protect the affected area with a loose cover and transport the injured person to a medical facility.
Some important things to remember:
- Don't remove frozen gloves, shoes, or clothing.
- Don't massage affected body parts.
- Don't expose affected body parts to temperatures above 112° F, such as a heater or a fire.
- Don't use safety showers, eyewash fountains, or other sources of water.
- Don't apply snow or ice to affected area.
- Don't apply ointments.